Invasive non-native species (INNS) - also known as alien, non-indigenous or exotic - are species or subspecies that occur outside of their natural range and are introduced into new waters by human action.

There are approximately 2000 non-native species in Great Britain, and about 300 of these are invasive. While the majority pose little or no risk, some do and can cause significant impacts to our native biodiversity through competition and disease and to our economy, as they are often costly to control or eradicate.

We are committed to tackling invasive species in England and Wales and working with all sea users to raise awareness of these species. By working together and being vigilant we can tackle any new arrivals at an early stage, thereby preventing their establishment and reducing any likely impacts.

The production and implementation of biosecurity plans for specific operations or events is considered a matter of good practice. Plans can make a positive contribution towards controlling the introduction and spread of INNS in our waters.

Read the latest advice on marine biosecurity for commercial and recreational users of the conservancy (GB non-native species secretariat).

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